Nah, just a bot to keep some level of activity around here The Mazda’s are sometimes hard to identify. Interesting enough, Mazda never really manufactored its own tubes, but instead rebranded them. Mazda France started in the early 50s and Mazda was used as a brandname in the UK a lot later. They were only losely related through Thomson, the parent company. The Mazda tubes from the UK, which mostly originate from the late 60’, are often rebadged Brimars, and sound close to the Mullards and Philips tubes of that time! Going from your description, I suspect yours may be relabelled Brimars. Do you have a picture of them? The UK Mazda’s mosty come in blue packaging and labeling. The Mazda tubes from France, which came earlier, have different characteristics and often carry a white or golden label. If you look at the French silver plate versions, and compare them to the early GE 5751 design, you will see that they are almost identical. In the 50s, GE owned part of Mazda France. They also owned the Mazda trademark which was used for premium quality incandescant bulbs in the 30s. To me, the silver plate Mazda sounds more open than Mullards, with a more even balance and better extension at the top and less emphasis on the mids. They have their own unique sound signature, but if you like the GE’s you may want to give it a go if you can get a hold of one! They do share the openness and transparancy with the early 50s/60s GE tubes.